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Goodwill and other intangibles (Tables)
 9 Months Ended
Sep. 30, 2025
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Intangible Assets and Goodwill [Table Text Block]
The following table shows the activity in goodwill and other intangible assets for the three-month and nine-month periods ended September 30, 2025 and 2024.

(in thousands)GoodwillOther
intangible assets		Total
July 1, 2024$159,595 $4,012 $163,607 
Amortization— 287 287 
September 30, 2024$159,595 $3,725 $163,320 
July 1, 2025$159,595 $2,890 $162,485 
Amortization— 248 248 
September 30, 2025$159,595 $2,642 $162,237 

(in thousands)GoodwillOther
intangible assets		Total
December 31, 2023$159,595 $4,652 $164,247 
Amortization— 927 927 
September 30, 2024$159,595 $3,725 $163,320 
December 31, 2024$159,595 $3,437 $163,032 
Amortization— 795 795 
September 30, 2025$159,595 $2,642 $162,237 
Intangible Assets Disclosure [Text Block]
The following table shows the balance of acquired intangible assets at September 30, 2025 and at December 31, 2024:

September 30, 2025
December 31, 2024
(in thousands)Gross Carrying AmountAccumulated AmortizationGross Carrying AmountAccumulated Amortization
Other intangible assets:
Core deposit intangible assets$14,456 $11,814 $14,456 $11,019 
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]
Estimated amortization expense related to core deposit intangible assets for the remainder of 2025 and the next four years follows:

(in thousands)Total
Three months ending December 31, 2025$247 
2026887 
2027754 
2028618 
2029136